Cabriolet top with closure unit

Abstract

A cabriolet top having a top linkage which can be adjustable between a closed position, in which it spans a vehicle interior space, and an open position having at both sides of a vertical vehicle longitudinal central plane, in each case one link arrangement assigned a closure unit which can be adjusted by means of an actuating device between a locking and unlocking position and which, in its locking position in the closed position of the top linkage, secures a front bow, which connects the two link arrangements to one another, to a front cowl of the vehicle by means of a locking hook. The locking hook can be connected via a first joint to a first locking link pivotable about an axle fixed to the front bow and via a second joint to a second locking link pivotable about an axle fixed to the front bow.

The invention claimed is: 
     
       1. A cabriolet top of a motor vehicle, comprising a top linkage which is adjustable between a closed position, in which it spans a vehicle interior space, and an open position, in which it upwardly opens up the vehicle interior space, and which comprises, at both sides of a vertical vehicle longitudinal central plane, in each case one link arrangement which is assigned a closure unit which can be adjusted by means of an actuating device between a locking position and an unlocking position and which, in its locking position in the closed position of the top linkage, secures a front bow, which connects the two link arrangements to one another, to a front cowl of the vehicle by means of a locking hook, wherein the locking hook is connected via a first joint to a first locking link which is pivotable about an axle fixed to the front bow and via a second joint to a second locking link which is pivotable about an axle fixed to the front bow, and wherein the locking hook forms, together with the two locking links, a four-bar mechanism which can be actuated by means of the actuating device, wherein, the locking hook and second locking link are pivotable relative to each other via the second joint. 
     
     
       2. The cabriolet top as claimed in  claim 1 , wherein, to the first locking link, there is connected a coupling link which is articulatedly connected to a diverting lever which is acted on by the actuating device and which is pivotable about an axle fixed to the front bow. 
     
     
       3. The cabriolet top as claimed in  claim 2 , wherein the coupling link is articulatedly connected to the first locking link such that the longitudinal axis of said coupling link, in the locking position of the closure unit, assumes a beyond-dead-center position with respect to a connecting line between an articulation point of the coupling link on the first locking link and a pivot axle of the diverting lever, it being the case in the beyond-dead-center position that an adjustment of the closure unit proceeding from its locking position without actuation of the actuating device is blocked. 
     
     
       4. The cabriolet top as claimed in  claim 3 , wherein the coupling link and/or the diverting lever bear and/or bears, in the beyond-dead-center position, against a stop. 
     
     
       5. The cabriolet top as claimed in  claim 1 , wherein the actuating device is formed by an adjusting cylinder, in particular a hydraulic closure cylinder, or by an electric motor. 
     
     
       6. A cabriolet top of a motor vehicle, comprising a top linkage which is adjustable between a closed position, in which it spans a vehicle interior space, and an open position, in which it upwardly opens up the vehicle interior space, and which comprises, at both sides of a vertical vehicle longitudinal central plane, in each case one link arrangement which is assigned a closure unit which can be adjusted by means of an actuating device between a locking position and an unlocking position and which, in its locking position in the closed position of the top linkage, secures a front bow, which connects the two link arrangements to one another, to a front cowl of the vehicle by means of a locking hook, wherein the locking hook is connected via a first joint to a first locking link which is pivotable about an axle fixed to the front bow and via a second joint to a second locking link which is pivotable about an axle fixed to the front bow, and wherein the locking hook forms, together with the two locking links, a four-bar mechanism which can be actuated by means of the actuating device, wherein the actuating device is formed by a link of the top linkage, which link is driven by means of a main adjusting device of the top.